Hydraulic transmission substance



Oct. 1%, 1%34. c. REINHOLD 1,977,012

HYDRAULIC TRANSMISSION SUBSTANCE Filed July 23. 1931 lv/a 3 2 E W I -9 I 4 Patented Oct. 16, 1934 1,977,012 HYDRAULIC TRANSMISSION SUBSTANCE Charles Reinhold, Geneva, Switzerland Application July 23, 1931, Serial No. 552,785 In Switzerland July 31, 1930 2 Claims.

My invention relates to a semi-fluid substance,

for filling hydraulic presses and has for its object to produce a substance for this purpose which will not ooze by the tight garnitures.

The manufacturers of hydraulical machinery such as presses, lifting-jacks, brakes, shock-absorbers, have endeavored to provide a fluid which will not ooze, for the use of such a fluid would change radically the construction of such machinery. All oils however ooze and soften the leather. It was believed that for presses without valves which are consequently not in need of a particularly fluid matter in order to work, a substance like consistent engine grease or flowing vaseline or compounds of tallow with a mixture of substances to make it softer, might be used instead of liquids. Experiencehas shown that all these products are decomposed under the effect of pressure or heat, even at a relatively low temperature. After a short time, there remains in the press only a hard residue, unsuitable to its work, all liquid parts being absorbed by the oozing through the cup-leathers and the partitions of the cylinders. This happens whether the press operates or whether it rests. The use of tow-presses diminishes this loss, but cannot prevent it.

The present invention is a plastic or semi-fluid substance with the following qualities.

1. It is practically incompressible.

2. Will not ooze.

3. Will not become decomposed under the effect of heat or pressure.

4. Will not attack the metals of the constructions nor the garnitures.

5. Will not soften the garnitures (or packings).

6. Will preserve the same consistency in extreme temperatures.

7. And will keep indefinitely without losing its qualities.

These properties are found in a composition of asphalt contained in the form of a dispersion in the vaseline or in an oil such as the lubricating oil of motors or in vaseline oils or oils of paraffin.

The following proportions are not absolutely necessary and are given as examples:

Asphalt 40% Vaseline in weight The asphalt and vaseline having near points of fusion, they should be heated until liquid, when they will mix easily.

A more fluid substance will be obtained by the Care is to be taken to mix first the asphalt and the vaseline and to let cool down before adding the grease, then to workup the whole in order to obtain a homogeneous mixture.

The proportions of greasy substances which can be fixed by asphalt vary according to its origin and degree of hardness and according to the nature and consistency of the, greasy substances employed. If the admissible percentage is exceeded,

the mixture might ooze at a temperature less high in proportion as the percentage of asphalt will be less or the fat substance employed more fluid, but in no case, will the mixture be decomposed, under the infiuenceof heat or pressure.

The annexed drawing shows an example of a form of execution of a hydraulic pressworking with a substance of filling according to the invention.

The metallic body of the press is provided with an exterior thread 1' for the purpose of fixing the press in a frame not shown on the drawing.

Inside of body 1 there are two cylinders 2 and 3 of inequal diameters communicating with each other in a permanent manner. The big cylinder 2 includes the large piston 4, which, when the press is in use, causes the pushing effort. The piston 4 is guided bya ring 9 screwed in the body 1 and is surmounted by a cup-leather 6 not fixed to it.

The small cylinder 3 contains piston 5made tight by a cup-leather. A threaded rod 8 moved by hand by lever 11, screws into thread 8' of body 1 and connects with piston 5 which it forces to descend into cylinder 3.

The space between the two pistons 4 and 5, being filled with a substance according to the invention, the said substance is pushed back by the descent of piston 5 and transmits the push to the large piston 4 which moves according to the proportion of its surface as compared to the small piston 5.

A spiral spring 10, placed in cylinder 2, which being supported by ring 9 constantly presses on piston 4, with a tendency to replace it in its original position, and indirectly piston 5, as soon as the threaded rod 8 is unscrewed. Spring 10 therefore connects continually the parts enclosed in body 1.

It is remarkable that the hydraulic press above described requires no tow, or stufling nor auxiliary reservoir nor a filling hole, and that the cupleathers are not fixed to the pistons which would be impossible with an ordinary filling. It is therefore a device of great simplicity and the absence of the filling hole eliminates the risks of loss difficult to avoid under high pressures.

The principal advantage consists in the fact that when the press is filled, there is no more any need to add matter to keep up the filling. As there is no oozing the press remains clean. The cup-leathers work under the best conditions, being kept in excellent order by the substance of the invention.

I claim:

1. A semi-fluid substance for filling hydraulic presses and the like composed of 60% to 90% of asphalt and 10% to 40% of greasy fluid substance.

2.A semi-fluid substance for filling hydraulic presses and the like composed of 30% to 70% of asphalt and 30% to 70% of greasy thick sub stance.

CHARLES REINHOLD. 

